diff --git a/pyminifier/__init__.py b/pyminifier/__init__.py
index 0e61063..e66b96a 100644
--- a/pyminifier/__init__.py
+++ b/pyminifier/__init__.py
@@ -267,8 +267,11 @@ def pyminify(options, files):
             print((
                 "{sourcefile} ({filesize}) reduced to {new_filesize} bytes "
                 "({percent_saved}% of original size)").format(**locals()))
-        p_saved = round(
-            (float(cumulative_new) / float(cumulative_size) * 100), 2)
+        if cumulative_size:
+            p_saved = round(
+                (float(cumulative_new) / float(cumulative_size) * 100), 2)
+        else:
+            p_saved = 0
         print("Overall size reduction: {0}% of original size".format(p_saved))
     else:
         # Get the module name from the path